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Journal of Bacteriology, December 1999, p. 7221-7227, Vol. 181, No. 23
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Cloning and Analysis of the Capsid Morphogenesis Genes of Pseudomonas aeruginosa Bacteriophage D3: Another Example of Protein Chain Mail?

Zeynab A. Gilakjan and Andrew M. Kropinski*

Department of Microbiology and Immunology, Faculty of Health Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada

Received 7 May 1999/Accepted 10 September 1999

The terminal DNA restriction fragments (PstI-D and -B) of Pseudomonas aeruginosa bacteriophage D3 were ligated, cloned, and sequenced. Of the nine open reading frames in this 8.3-kb fragment, four were identified as encoding large-subunit terminase, portal, ClpP protease, and major head proteins. The portal and capsid proteins showed significant homology with proteins of the lambdoid coliphage HK97. Phage D3 was purified by CsCl equilibrium gradient centrifugation (rho  = 1.533 g/ml), and sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed six proteins with molecular masses of 186, 91, 79, 70, 45, and 32 kDa. The pattern was unusual, since a major band corresponding to the expected head protein (43 kDa) was missing and a significant amount of the protein was retained in the stacking gel. The amino terminus of the 186-kDa protein was sequenced, revealing that the D3 head is composed of cross-linked 31-kDa protein subunits, resulting from the proteolysis of the 43-kDa precursor. This is identical to the situation observed with coliphage HK97.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Faculty of Health Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada. Phone: (613) 533-2459. Fax: (613) 533-6796. E-mail: kropinsk{at}post.queensu.ca.

Journal of Bacteriology, December 1999, p. 7221-7227, Vol. 181, No. 23
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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